Dealer sentenced to 6 years in teen's fatal overdose

The last of four people involved in the case of a 16-year-old Plano boy's fatal heroin overdose was sentenced to six years in federal prison.

Nathaniel Edward Gonzalez, 21, of Richardson, who was sentenced Tuesday, sold the drugs to Brenden Thayer the day before the high school sophomore was found dead in his bed last year.

Gonzalez bought the drugs from Angel Sierra, who earlier this year pleaded guilty to conspiracy to distribute heroin and was sentenced to 24 years in prison.

His brother, Alberto Sierra, pleaded guilty to distributing more than 100 grams of heroin and was sentenced to three years in prison. Police say the Sierra brothers are illegal immigrants who sold drugs in fast-food restaurant parking lots.

Melanie Danielle Caple, the sister of Gonzalez, pleaded guilty to a lesser offense and was sentenced to nearly two years in prison for driving her brother to deliver the drugs.